title: Interday reliability of peak muscular power outputs on an isotonic dynamometer and assessment of active trunk control using the chop and lift tests.
abstract: BACKGROUND
  Assessment techniques used to measure functional tasks involving active trunk control are restricted to linear movements that lack the explosive movements and dynamic tasks associated with activities of daily living and sport. Reliable clinical methods used to assess the diagonal and ballistic movements about the trunk are lacking.
  
  
  OBJECTIVE
  To assess the interday reliability of peak muscular power outputs while participants performed diagonal chop and lift tests and maintained a stable trunk.
  
  
  METHODS
  Controlled laboratory study.
  
  
  METHODS
  University research laboratory.
  
  
  METHODS
  Eighteen healthy individuals (10 men and 8 women; age  =  32 ± 11 years, height  =  168 ± 12 cm, mass  =  80 ± 19 kg) from the general population participated.
  
  
  METHODS
  Participants performed 2 power tests (chop, lift) using an isotonic dynamometer and 3 endurance tests (Biering-Sørensen, side-plank left, side-plank right) to assess active trunk control. Testing was performed on 3 different days separated by at least 1 week. Reliability was compared between days 1 and 2 and between days 2 and 3. Correlations between the power and endurance tests were evaluated to determine the degree of similarity.
  
  
  METHODS
  Peak muscular power outputs (watts) derived from a 1-repetition maximum protocol for the chop and lift tests were collected for both the right and left sides.
  
  
  RESULTS
  Intraclass correlation coefficients for peak muscular power were highly reliable for the chop (range, 0.87-0.98), lift (range, 0.83-0.96), and endurance (range, 0.80-0.98) tests between test sessions. The correlations between the power assessments and the Biering-Sørensen test (r range, -0.008 to 0.017) were low. The side-plank tests were moderately correlated with the chop (r range, 0.528-0.590) and the lift (r range, 0.359-0.467) tests.
  
  
  CONCLUSIONS
  The diagonal chop and lift power protocol generated reliable data and appears to be a dynamic test that simulates functional tasks, which require dynamic trunk control.
authors.affiliation: Department of Rehabilitation Science, University of Kentucky, Lexington, USA. Palmert1@nku.edu
authors.forename: Thomas G
authors.initials: TG
authors.lastname: Palmer
authors.forename: Timothy L
authors.initials: TL
authors.lastname: Uhl
mesh_terms: D000328:Adult; D005080:Exercise Test / Q000379:methods*; D005260:Female; D006801:Humans; D017770:Lifting; D008297:Male; D009068:Movement; D053580:Muscle Strength; D053581:Muscle Strength Dynamometer; D018482:Muscle, Skeletal / Q000502:physiology; D010807:Physical Endurance / Q000502:physiology*; D011187:Posture